单项选择题
Vents are led from the engine to head tank （） from the cooling water.
A.for the release of air
B.for the release of water
C.in order to the release of air
D.because the release of air
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A.throw
B.web
C.main bearing
D.deflection -
单项选择题
Valve overlap is the period during which （）.
A.the inlet valve is open
B.the exhaust valve is open
C.both valves are closed
D.both valves are open -
单项选择题
Valve gear knocks are more easily located while the engine （）.
A.is running
B.stops
C.is repaired
D.lacks of oil
